Experimental Study on Freeze-thaw Strength of Improved Filling Materials for High-speed Railway Subgrade
In order to determine the strength characteristics of fillers,freeze-thaw strength tests were carried out based on railway engineering examples,and the influencing factors and mechanism of freeze-thaw strength of improved fillers were studied according to the test results.The results showed that the strength of the modified filler increased after 7 days of curing,maintained well after 28 days,and stabilized after 10 freeze-thaw cycles.With the increase of cement content,the residual strength of the modified filler is high after freeze-thaw cycle,and there is no significant difference between the strength before and after melting.The freezing depth of cement and fly ash fillers is smaller than that of cement modified fillers,but the frost heave rate and melt settling coefficient are larger.The freeze-thaw resistance of cement fillers is reliable,and both cement fillers and fly ash fillers can be used to improve the grade crushed stone.The upper limit of fly ash content is 12%,and ex-cessive application of fly ash will increase the freeze-thaw deformation of the filler.
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